How to disable ellipsis autocorrect on macOS?
Go to System Preferences, select Language & Text, then the Text tab, and deselect the box for that option.
Or you can disable the feature completely by deselecting the box at the top.
In Mavericks at least, this seems to be controlled by the "Use smart quotes and dashes" feature found in System Preferences → Keyboard → Text. Uncheck the box, and the behavior goes away, even in Evernote.
If "Smart Quotes" is active in Keyboard Settings but you don't want smart ellipses, Edit menu in most applications on OS X Yosemite, unchecking "Smart Dashes" found in Edit -> Substitutions -> Show Substitutions stops autocorrect of three periods to ellipsis.
On older OS X, you could see and disable this autocorrection, but now the interface is similar but you have to add this entry to manage it.
Make three periods generate three periods. Also look for app settings like smart quotes and dashes. Those can really be bad when writing code.
The official term for this is “Create text replacements” and you have to add the ones you prefer like I have shown...
- https://support.apple.com/guide/mac-help/replace-text-punctuation-documents-mac-mh35735/mac